Loose-leaf binder.



J. G. DAWSON.

LOOSE LEAF BINDER.

APPLIOATION' FILED 1111.14, 1910.

967,336. Patented Aug. 16,1910.

WEEE/@ .J0 J6 111 1HE Nomals Ps1-Ens co. wAsn'mazoN, D. c.

l Mm.

rNTTED STATES PATENT OFFICE.

JAMES C. DAWSON, F WEBSTER GROVES, MISSOURI, ASSIGNOR TO SIEBER &TRUSSELL MANUFACTURING COMPANY, A CORPORATION OF MISSOURI.

LOOSE-LEAF BINDER.

Specification of Letters Patent.

Patented Aug. 16, 1910.

Application filed January 14, 1910. Serial No. 538,107.

The invention relates to that type of` binders comprising a back plate,a pair of opposed clamping plates, and mechanism for controlling thelatter plates.

The object of the invention is to simplify and improve the controllingmechanism;

` and it consists of a structure such as is hereinafter described, inwhich- Figure l is a plan view of the binder when closed; Fig. 2 is asimilar view, the binder being open; Fig. 3 is a longitudinal sectionalview on the line 3-3 of Fig. 2; and Fig. l is a det-ail plan viewshowing a modified form of construction.

A back plate is shown at 10, and has the usual upstanding end portions11, 12, and the usual guide plates 13, 14.-, under which the instandingleaves 15, 16, of the side or clamping plates slide. There is alsopresent a threaded controlling rod 17, journaled upon the median line ofthe back plate 10 and having one of its ends squared, as shown at 18,for receiving a key.

The clamping plates are actuated by the rod 17 through the medium of twopairs of crossed levers 19, 20, 21, 22, each pair of levers beingpivoted, as shown, respectively, at 23, 21, upon blocks 25, 26, fixed tothe back plate 10. One end of each lever is connected to one of theclamping plates by means of a stud, as 27, fixed in the lever andsliding in a longitudinal slot, as 28, in the instanding leaf of theplate. The inner ends of the levers of each pair extend beyond thesecuring pivots 23,24, and project toward the side of the binderopposite to that from which the outer end of the lever is secured, suchprojecting lever ends 29, 30, being slotted to form cam faces 31, 32, 33and 34, for engagement by a stud 35 carried by a nut 36 running on athreaded portion of the rod 17.

The two pairs of levers are alike, except that their outer ends areoppositely directed,

preferably projecting toward the adjacent end of the binder. The threadson the rod 17 cooperating with the two ends are, therefore, inclinedoppositely, to the end that the spreading' action of the two pairs oflevers may be simultaneous. Then the rod 17 is rotated to carry the stud35 to the outer ends of the cam slots of the levers, as shown in Fig. 1,the side or clamping plates of the binder are drawn together. VVhen therod is turned in the opposite direction, carrying the nut to the innerends of the cani slots, the binder is opened.

lVhile the several levers are shown as having their inner endsprojecting toward the opposite side of the binder from that to whichtheir outer ends are attached, it is obvious that such inner ends mayproject in either direction, it being necessary only that their camslots be oblique to the controlling rod.

In the modification shown in Fig. 4L of the drawings, the levers aresecured to the side or clamping plates by means of studs 37, fixed inthe plate and engaging slots, as 3S, in the lever. The action issubstantially the same except that the leverage is increased as thebinder closes.

I claim as my inventionl. In a loose leaf binder, in combination, a backplate, a threaded rod journaled thereon, a pair of clamping plates, apair of levers secured to the back plate by a fixed pivot and havingtheir inner ends provided with intersecting cam faces, the outer end ofeach lever being in sliding engagement with one of the clamping plates,and a nut in threaded engagement with the rod and carrying a studengaging the several cam faces of the levers.

2. In a loose leaf binder, in combination, a back plate, a laterallymovable side plate, a lever pivoted on the back plate and having one ofits ends in sliding engagement with the side plate, its opposite endbeing longitudinally slotted, a threaded rod journaled on the backplate, and a nut running on the rod and carrying a` stud projectingthrough the lever slot, such slot being oblique to the rod.

3. In a loose leaf binder, in combination, a pair of reciprocableclamping plates, a back plate, two pairs of crossed levers pivoted onthe back plate, each lever having one of its ends in sliding` pivotalengagement a stud engaging the longitudinal slots of ono Wlth one of theclamping plates and having o the palrs of levers.

its other end lono'itudnally slotted a rod 41 7 e T journaled on thebback plate and 7having v JAMLS C' DA boh right and left threadedportions, nuts run- Witnesses:

ning on the two threaded portions of the LOUIS K. GILLsoN,

rod, each of such nuts being` provided with E. M. KLATCHER.

